Automatic phonograph stop



Muay 27 1924,. 1,495,702

S. E. MCNULTY AUTOMATICk PHONOGRAPH STOF Filed Jan. 1l. 1923 Patented May 27, 1924.

travez STEER/ETT E. MCNULTY, O'F LOS ANGELES, CALIFORNIA.

AUTOMATIC PHONOGRAIPH STOP.

Application filed January 11, 1923. Serial No. 611,967.

Z 1o @ZZ whom t may conce/Mt.'

Be it known that I, STERRETT E. Mo- NULTY, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Automatic Phonograph Stops, of which the following is a specification.

AMy present invention relates to an automatic phonograph stop, itbeing the primary object of my invention to provide simple means by which, at the time a disc record is placed upon a revolving table, mechanism can be placed in position to stop the phonograph when a selection, or a predetermined part of a selection, shall have been completed.

It is a further object of my invention to provide means of the character referred t0 which shall be adapted to use in connection with records of different sizes, for example, twelve inch records, ten inch records, and eight inch records. H

It is a further object of my invention to provide means whereby my automatic stop may be, by adjustment, adapted to usekr on phonographs provided with turn-tables at various elevations.

It is a further object of my invention to provide means of the character referred to which may be manufactured at a moderate costy and which may be either securedto instruments in advance of their sale or may be conveniently applied to instruments which are already in use.

It is a further object of my invention to provide an automatic stop which shall comprise a brake operating on the toggle principle and a withholding means therefor, this withholding means being preferably in the form of an arm which may be engaged by a phonograph needle during the lateral travel thereof across a phonograph record.

Further objects of my invention will appear from the following description and the appended claims,it being understood that various parts of my invention may be independently used, and that various modifications may be made therein without departure from the spirit and vscope of my invention as the same is indicated in the said description and the claims. It is believed that the general character of my resent 1invention will be readily understood from the following description of a preferred embodiment thereof taken in connection with the accompanying drawings, in which- Figure 1 is a vertical section through a revolving table having a record thereon and showing my attachment inl position.

Fig.` 2 is a plan view corresponding to Fig. 1 except that, the rendering of a selection having been completed, the withholding arm has been released and the phonograph has been stopped.

Fig. 3 is a detail view taken on the line 3-3 of Fig. 2.

Fig. 4 is a sectional bottom view, on the linea-l of Fig. 1.`

In the embodiment of my invention which I have chosen for purposes of illustration, I prefer to provide a hollow post 1 which may be secured in proximity to a revolving table by such means as the screws 2 and may be provided with internal threads 3, adapted to be engaged by corresponding threads upon a bearing element l, which is verticallyI adjustable therein by al milled head 5.

Upon the top of the milled head 5 I may secure by means such as the screw 6 a brake arm 7 adapted to be withheld, during the rendering of a selection, by any suitable means. As a convenient means for preventing a premature braking action by the brake arm 7, I may provide means such as the withholding arm 8, shown as mounted concentrically therewith. The brake arm 7 may be comparatively short, and may be provided'with means such as the spring 9, se-

cured at one end in a depending portion 10- thereof, and secured at the other end to the post 1 by means of the screw 11. Instead of providing an engaging means directly upon the brake arm 7, I prefer to adapt this element to receive alternatively any one of a plurality of extensions, an extension 12 being shown in place, and alternative extensions 13 and 14 being indicated in Fig. 2, the extensions 13 and 14 being adapted to use with smaller turntables.

In order to hold the brake arm in an inoperative position until its action shall be desired, I provide an abutment 15 thereon, preferably depressed into such a position that it may be engaged by the withholding arm 8 when the latter is moved into the position shown in Fig. 1. The arm 8 is preferably provided with a plate 16 movable thereon, and the latter may advantageously have a covering 18 of hard rubber, celluloid or the like secured thereto by means such as the clips 18, 19, in order to provide a very smooth edge for engagement with the needle or the needle-holding element of a phonograph.

It will be understood by the foregoing construction, that the arm 8 may be moved to extend to any desired distance across a record, and to terminate at a desired point. When the phonograph needle, in its travel toward the center of a record, shall finally clear the end of the arm 8, the arm 8 will swing from the position shown in Fig. 1 to the position shown in 2, this swinging motion being produced by the action of the spring 9 in bringing the brake element upon the end of the extension 12 (or 13 or 14) into operative position.

From the foregoing description it will be evident that l have provided comparatively simple means, comprising an extensible arm adapted to be brought into engagement with a phonograph needle, for stopping the rotation of a phonograph table at any desired predetermined point, and the braking element 20 may be a mere rubber band secured by means of a slight expansion upon the end of the downturned brake arm, this element being adapted to contact either with the edge of a disc record, as shown in Fig: 2, or with the periphery of a revolving table, as shown in Fig. 1. My device can be easily applied to phonographs already in use, and by an easy substitution of brake arms of varying length it can be employed in connection with records or turntables of any of the usual sizes. By reason of its simplicity, my device can be manufactured and sold at a very moderate price.

What I claim is:

1. In an automatic stop for phonographs, an attaching member adapted to be secured adjacent to a revolving table, restraining means thereon adapted to be engaged by a phonograph needle during the rendering of. a selection, and a brake arm adapted to be withheld from a braking position by said restraining arm.

2. ln an automatic stop for phonographs, an attaching member adapted to be secured adjacent to a revolving table, restraining means thereon adapted to be engaged by a phonograph needle during the rendering of a selection, and a brake arm adapted to be withheld from a braking position by said restraining arm, said brake arm being held under tension.

3. ln an automatic stop for phonographs. an attaching member adapted to be secured adjacent to a revolving table, restraining means thereon adapted to be engaged by a phonograph needle during the rendering of a selection, and a brake arm adapted to be Withheld from a braking position by said restraining arm, said brake arm being held under tension, and said restraining arm being eXtensible.

1i. ln an automatic stop for phonographs, a post adapted to be secured adjacent to a revolving table, an arm pivotally movable relatively thereto, a bearing element secured to said post, and means, comprising a milled head upon which an arm is pivoted for adliusting said bearing element relatively to said post.

5. ln an automatic stop for phonographs, a brake arm, extensions of varying length adapted for use therewith, and means for holding said brake arm in an"inoperative. position during'the rendering of a selection, said means comprising a restraining arm adapted to be engaged by a phonograph needle.

6. ln an automatic stop for phonographs, a restraining arm supporting a brake-carry ingv element, and means for varying the length of said arm.

7. In a phonograph stop, a brake arm, and means for extending said arm to effect a braking action upon records or turntables of varying diameters.

In testimony whereof I have signed my name to this specication.

S. E. MCNULTY. 

